The coroner has determined that Johnson -- who suffered from diabetes -- died of "diabetic ketaocidosis." While some suspected foul play or a drug overdose when the hard-partying Johnson passed away, the coroner had then stated that the cause of death was "natural."

An heiress to the Johnson and Johnson fortune and allegedly engaged to reality star Tila Tequila, Casey was found dead in her L.A. home last month.